-LRB- CNN -RRB- -- A shark bit a 16-year-old boy across both legs as he was surfing in Hawaii on Sunday , CNN affiliate KHON reported .

The attack came four days after a shark severed the right arm of a German tourist while she was snorkeling .

In the Sunday incident , the teen was surfing in Pohoiki Bay when an 8-foot gray shark attacked him , the affiliate reported .

He was taken to a hospital , but his condition was not known .

Authorities brought in helicopters to survey the area for sharks , but were unsuccessful .

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This shark attack is the fourth in the last month , and 9th for the year in Hawaii , the affiliate said .

Last year , Hawaii had 11 shark attacks .

While shark attacks have been on the uptick in recent years , according to the University of Florida , the fatality rate in the United States is just 2 % .

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This is the fourth shark attack this month

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Hawaii has seen 9 attacks this year